Merge branch 'stable-5.13' into stable-6.0

* stable-5.13:
  Remove stray files (probes or lock files) created by background threads

Change-Id: I7af1355a77f14995118145162f6bb8a4f1755f2b

diff --cc org.eclipse.jgit/src/org/eclipse/jgit/util/FS.java
Simple merge